Heat detector



FIG. 1 is an elevational view of a heat detector showing my new design:

FIG. 2 is an elevational view thereof, 90° removed from FIG. 1;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a fragmentary view in partial section taken along line 5--5 of FIG. 1.

The conventional wire grill, partially shown in FIGS. 1, 2 and 5, is understood to cover the entire areas indicated. 

The ornamental design for a heat detector, as shown and described. 